what is a calorie, really, and how many of them do we actually need? Calories are a way of keeping track of the body's energy budget .A calorie is unit of energy,it is way of measuring how much energy our body get from eating and drinking. A healthy balance occurs when we put in about as much energy as we lose. If we consistently put more energy into our bodies than we burn, the excess will gradually be stored as fat in our cells, and we'll gain weight. If we burn off more energy than we replenish, we'll lose weight So we have to be able to measure the energy we consume and use, and we do so with a unit called the calorie. One calorie, the kind we measure in food, also called a large calorie, is defined as the amount of energy it would take to raise the temperature if one kilogram of water by one degree celsius. ...
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